Please Help! I am in desperate need
Question 1
Answer the true/false questions based on the d...
Chemistry, 18.11.2020 23:40 starburst2005
Please Help! I am in desperate need
Question 1
Answer the true/false questions based on the diagram above.
I have no clue where the graph is tho, my teacher did not post one.
Addition of a catalyst will change the value for ΔH
True
False
Question 2
Consider the chemical reaction equation shown.
H + H--> H-H
Is this reaction endothermic or exothermic?
a
Endothermic
b
Exothermic
Question 3
a
AB
b
BC
c
CD
d
DE
Question 4
A chemical reaction has a reaction enthalpy of −512 kJ/mol. Is it endothermic or exothermic?
a
Endothermic
b
Exothermic
Question 5
What is the energy required to evaporate two moles of liquid water given the following equations?
2H2(g) + O2(g) → 2H2O(g) ∆H = -483.6 kJ
2H2(g) + O2(g) → 2H2O(l) ∆H = -571.6 kJ
a
44.0 kJ
b
88.0 kJ
c
527.6 kJ
d
1055.2 kJ
Answers: 2
Chemistry, 21.06.2019 15:00
1) how many electrons are in each energy level of the following elements? a. he b. na c. na d. ne 2) how many valence electrons are percent in the following atoms? a. s b. mg c. be d. cl 3) which of the following elements are stable as atoms? a. he b. o c. cl d. ar if you are able to provide the work as to how you got the answers that would be greatly appreciated. : )
Answers: 1
Chemistry, 22.06.2019 01:30
Aroller coaster car is traveling down a track at 22 m/s. the car has a mass of 2000 kg. what is the kinetic energy of the car? a) 22,000 j b) 968,000 j c) 484,000 j d) 44,000 j
Answers: 2
Chemistry, 22.06.2019 17:30
In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j
Answers: 2
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